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COMMITMENTS AND CONTINGENCIES - Narrative (Details) - USD ($) | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2021 | Dec. 31, 2020 | Sep. 30, 2021 | Mar. 26, 2020
Line of Credit Facility [Line Items] |  |  |  |
Term of lease contract, maximum renewal term |  |  | 12 years |
Purchase obligation |  |  | $ 247,500,000 |
Section 301 Tariff Refunds |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Potential positive impact of approval of requested Tariff refunds |  |  |  | $ 38,900,000
Tariff refund | $ 14,700,000 | $ 24,800,000 |  |
Tariff refund receivable |  | 14,700,000 | $ 0 |
Recognized in current period |  | 38,900,000 |  |
Section 301 Tariff Refunds, Accrued Interest |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Potential positive impact of approval of requested Tariff refunds |  |  |  | $ 600,000
Recognized in current period |  | $ 600,000 |  |

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- Definition Term of lessee's operating lease renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=123408670&loc=SL77918673-209980 + Details
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